100%. Started reta back in June at 2mg weekly. Had been maxed out on tirz for a full year prior. Cut that dose in half rather than dropping it entirely since I still wanted the mental food chatter kept quiet. Mostly worked out that way. Tried a week running the complete 15mg tirz alongside 4mg reta, wasn't terrible but wasn't great either. Went back down to 7.5mg tirz since reta's clearly carrying its weight. Meanwhile I've been climbing on reta gradually, bit by bit.
Currently running 3mg every other day. Works out to roughly 9mg weekly overall. Feels like the whole half-life conversation might not be fully settled science yet. And like everything else, bodies vary wildly. Every-other-day dosing seems to keep reta's benefit genuinely active in my system in a way that twice weekly never quite matched. At least for how my particular biology handles it.